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Being one of the leading signaling protocols of VoIP applications, SIP protocol becomes popular in IP-based multimedia services, and securing SIP has become a priority. In this paper, we develop a novel authentication scheme which relies only on one way hash functions. In contrast to the computationally expensive asymmetric RSA signature scheme, our scheme is efficient in signing and verifying procedures. And hash tree is exploited to store and verify key information. Our scheme can be used in SIP entities which have less computation power and limited memory.